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Breakdown Features of Various Microstrip-Type Gas Counter Designs and Their ImprovementsBreakdown mechanisms and spurious pulses, the precursors to some breakdowns, were studied experimentally for both uncoated and coated Microstrip Gas Counters (MSGCs) of different geometries, as well as for MicroGap Counters (MGCs) and for the "Compteur A Trou" (CAT). It was found that in all cases the breakdowns occurred through surface streamers, although the exact mechanism of streamer formation depended on the particular detector design. Based on these studies, new designs of microstrip detectors, in which the role of the substrate was minimized, were elaborated and tested. In some of these detectors, especially with large pitches (greater than 2mm), gains up to 2-3 x 10(exp 5) were achieved together with good rate characteristics. The ultimate gain limit in all geometries was still set by spark-inducing streamers which appeared at some critical charge density in the avalanche. To avoid this, and particularly to enhance the performance of small-pitch MSGCs, preamplification structures can be used. Utilizing a parallel plate avalanche chamber as a front end to an MSGC resulted in an overall gain of approximately 10(exp 6), limited in this case only by charge saturation.
Document ID
19990008633
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Peskov, V.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Ramsey, B. D.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Fonte, P.
(Coimbra Univ. Coimbra, Portugal)
Date Acquired
August 19, 2013
Publication Date
January 1, 1998
Publication Information
Publication: Conference Proceedings: Proceedings of IEEE Transactions on Nuclear Science
Subject Category
Instrumentation And Photography
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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